Z8 Microcontrollers
ZiLOG Instruction Descriptions and Formats
UM001601-0803 12-77
WDH
WATCH-DOG TIMER ENABLE DURING HALT MODE
WDH
Watch-Dog Timer Enable During HALT Mode
WDH
Instruction Format:
Operation:
When this instruction is executed it will enable the WDT (Watch-Dog Timer) during HALT mode. If this
instruction is not executed the WDT will stop when entering HALT mode. This instruction does not clear the
counter, it just makes it possible to have the WDT function running during HALT mode. A WDH instruction
executed without executing WDT (5FH) has no effect.
Note:
The WDH instruction should not be used following any instruction in which the condition of the flags is important.
Example:
If the WDT is enabled, the statement:
WDH
Op Code: .BYTE 4FH
will enable the WDT in HALT mode.
Note: This instruction format is valid only for the Z86C04/C08 and Z86E04/E07/E08.
Flags: C: Unaffected
Z: Undefined
S: Undefined
V: Undefined
D: Unaffected
H: Unaffected
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